The fact that you still set up the game with an explanation and the movement of your character despite everything is proof that you tried! Ragdoll physics games are super hard to manage to begin with, but as a fighting game, it sure had to be quite a challenge. I guess an idea would have been to fake some animation movements for the AI, making the string pull in a direction depending on what the player is doing to try to respond to them. Aside from that, in all honesty, the project sounded complicated so it's hard to give much advice on it, but all I can say is good job for trying it still! The idea had potential.
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Thank you so much for your comment.
My initial idea wasn't a typical ragdoll, but rather something more like a robot....a clean, crisp movement, and the movement should almost freeze when the string is pulled tight...So I used Unity's Articulation Body to connect everything, and try to change the stiffness of the joints during play, but failed achieve that effect.
I originally included part of the video below in the game, but for some reason, the web version couldn't play it, so I replaced it with an image.